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Thread: Unusual Drum Switch Configuration

  1. #1
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    Default Unusual Drum Switch Configuration

    Hello everyone.
    This is my very first post so please bear with me.
    I'm in a process of changing my broken Drum switch which is connected to a Baldor single Phase 1/2 horse power motor. There are 6 wires coming out of the motor.
    My problem is how do connect those wires to a chinese made drum switch?
    Attached file is the drum switch with its configuration.
    How do I attach L1,L2 and T1,T2,T3,T4,T5 & T8 to this drum switch?
    Your help is greatly appreciated.
    Jonathan
    Attached Images Attached Images

  2. #2
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    A.B. Normal

    Default Re: Unusual Drum Switch Configuration

    Hi, please post a wiring diagram for your motor as well as the voltage you want to run it on and I'll make you a drawing..........Rod.

  3. #3
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    Default Re: Unusual Drum Switch Configuration

    Quote Originally Posted by Rod Sheridan View Post
    Hi, please post a wiring diagram for your motor as well as the voltage you want to run it on and I'll make you a drawing..........Rod.
    Thanks a lot Rod for a very quick response.
    Attached is the motor's wiring diagram. I would like to run it on 230 volts.BaldorL3504wiring.jpg
    Please be aware that I am not very electrical oriented person, so please, if you can make the drawing straightforward as possible, I would really appreciate it.
    Thanks again,
    Jonathan

  4. #4
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    Steve Morris

    Default Re: Unusual Drum Switch Configuration

    it looks to me that for 240 service, the two run windings are put in series by connecting the white and orange. the the run winding lines are blue and yellow. the red and black leads are the start winding

    generally the run winding is hooked to the reversing section of the switch and the start winding to the on/off section

    but that switch only has on/off for one hot lead for 120 service, for 240 service there should be two on/off sections
    my shop is a beaver lodge
    steve, sarnia, ont

  5. #5
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    Default Re: Unusual Drum Switch Configuration

    Visio-Drum Switch.pdf

    Hi.'ve attached a drawing for your switch and motor.

    There are a couple of issues

    1) all motors need thermal overload protection. Is your motor marked as thermally protected? The motor wiring diagram indicates an optional thermal protector.

    2) the drum switch has to be rated for 240 volts, single pole.

    There is no requirement to break both lines in a motor starter unless the starter is also the disconnecting means. In your case I'm assuming that you have a plug on the motor.

    Let me know about the switch and overload protection please............Thanks, Rod.

  6. #6
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    Steve Morris

    Default Re: Unusual Drum Switch Configuration

    Quote Originally Posted by Rod Sheridan View Post
    Visio-Drum Switch.pdf

    Hi.'ve attached a drawing for your switch and motor.

    There are a couple of issues

    1) all motors need thermal overload protection. Is your motor marked as thermally protected? The motor wiring diagram indicates an optional thermal protector.

    2) the drum switch has to be rated for 240 volts, single pole.

    There is no requirement to break both lines in a motor starter unless the starter is also the disconnecting means. In your case I'm assuming that you have a plug on the motor.

    Let me know about the switch and overload protection please............Thanks, Rod.
    rod, im kinda new to this 240 volt stuff, all my oldies are 120 so far
    so is considered safe to just switch one leg of a 240 supply to a motor?, leaving the other "side" still live?
    to me a double pole switch for 240 would be required
    my shop is a beaver lodge
    steve, sarnia, ont

  7. #7
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    Default Re: Unusual Drum Switch Configuration

    Hi Steve, since it's a piece of machinery and the unswitched conductor doesn't leave the machine, you only have to open one line for single phase or two lines for three phase.

    If the drum switch was the disconnecting means, then all lines must be opened, however on cord connected machines, the plug is considered the disconnecting means.

    The issue with contactors and switches is that often they're only rated for 240 volts if you break both lines. This helps extinguish the arc, which was why my question about the switch rating was included.

    Have a Happy New Year Steve, throw some extra nice poplar bark in for those Beavers...............Regards, Rod.

  8. #8
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    Default Re: Unusual Drum Switch Configuration

    Jonathan

    Did you check the unused terminals (no screws) to see if perhaps this is a 5 pole switch?

    If not, you can still switch both hot lines by rearranging the wiring a bit

    Last edited by APLJaK; 12-31-2011 at 03:52 PM.
    APLJaK

  9. #9
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    Default Re: Unusual Drum Switch Configuration

    Quote Originally Posted by APLJaK View Post
    Jonathan

    Did you check the unused terminals (no screws) to see if perhaps this is a 5 pole switch?

    If not, you can still switch both hot lines by rearranging the wiring a bit

    Hi APLJaK,

    I'm not quite sure if it is 5 pole but opening the drum itself, I noticed a very faint diagram that looks like this:



    Drum Switch.jpg

    Please excuse the graphic, I never good at it.
    There is also something written but it's in chinese characters.
    Thanks again for trying to help me out.
    Jonathan

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